Taylor Swift is no stranger to reinvention, dazzling fans yet again with her elaborate costume for the cover of her highly anticipated 12th studio album, The Life of a Showgirl. Turns out, her look has an iconic backstory. Legendary designer Bob Mackie spoke out about the eye-catching ensemble he created in a new Instagram post shared on Tuesday, August 19, revealing that it was originally put together for the "Jewel Finale" of the Las Vegas show, Jubilee.